Apparatus for testing aeronautical equipment



E. LUNDGREN APPARATUS PoR TESTING AERONAUTICAL EQUIPMENT Oct. 28, 1952 2 SHEETS-SHEET 1 Filed March 5, 1949 A Qn hw Nuk Q\ OSSK i l l i I Nq! lf7\r| N QM "mm, mvv mw, Pn

QW Y WV WIN mi mb mm ww Q mw mh Dn E. LUNDGREN 2,615,331 APPARATUS FOR TESTING AERONAUTICAL EQUIPMENT Oct. 28, 1952 Filed March s, 1949 2 SHEETS-SHEET 2 wh Nm N. mim.,

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Cttorneg Patented Oct. 28, 1952 APPARATUS Foa rrEs'rINd AERoNAUrrIoAL FtwnMEN'r1` Edwin Lundgrenl. Frederick, Md., assigner toFoS- ter Wheeler Qorporaton, New Y ork N.WY.', a.

corporation of New York 'Application MarenA 3, 1949,;'seria1znorfra8e- (Cl. iii-116,)

11. Claims, 1

This invention` relatesV to.r` aeronautical` test equipment and more particularly to apparatus for testing aeronautical apparatus under simulated'. altitude conditions.

In testing aeronautical equipment under simulated altitude conditions, airl is. normally intro.- duced Aat a desiredl temperature and at a desired pressure into a test cell containing the equipment. to be tested-to. thereby simulate in thecell atmospheric conditions at a predetermined altitude; When aircraft engines, particularly of vthe jet propulsion type, are tested in a. test cell; it is. necessary to Withdraw a large volume of the en-v ginev exhaust. gases from the cell; which with` drawn gases are normally at a temperature. of' 150C#ov to 3500 F'., and thereafter dispose of such gases. Normally exhaust gases are withdrawn from ay testing celll by means. of a plurality of exhausters or compressors which. are usually driven by electric motors.

The present invention provides apparatus forexhausting gases from a testcellV in which aircraft motors: of the. jet propulsiontype are tested', which gases are Withdrawn in theA desired volume and at they desired temperature and pressure byv the use of steam jet ejectors operated by steam generated through use of the heat contained in gases exhausted from the testing cell.

An object of the invention is toutilize the waste heat of exhaust gases from aircraft engines ofthe jet propulsion type installed for testing in a tes-t cell to thereby produce steam under pressure for utilization in steam ejectors for the purpose ofexhausting gases from they test cell'.

Another object of the present invention is to cool, wash and purify exhaust gases from test cells.

A further object of thepresent invention is to provide means for controlling the volume of gases exhausted from testv cells and the delivery pressure of the exhausted gases from exhausters or compressors operated by steam jet ejectors.

Another object of the present'invention is to utilize the heat recovery apparatus used for recovering heat from exhaust gases to heat gases that fall below a predetermined temperature.

A further object of this invention is to provide a simplified, economical and less time-consuming method of establishingdesired altitude conditions in test cells for testing aeronautical equipment.

The particular features and advantages which characterize the invention will bev understood from the following description when considered in connection with the accompanying drawings forminga part thereof and in which:

Fig; 1 is a plan View diagrammatically illustrating they apparatus ofthe present invention, and

Fig. 2 is a diagrammatic side elevational View taken on the line 2-21of`Fg. 1.

2i Like -characters of reference refer to, the. same or similar parts throughout the views.

Referringto thenrawings.; altitude testi-ng cells.,

two or which are.i11ustrated are designated by thev referencel numeral III. lThe cell'sarediyided intocompartments Hv and I2 by a, diaphragm |.3

and a propulsicnjet engine. I4 ismountedfwithin. each ceu soas to receive air from chamber |I'v and-discharge: exhaust gases into. chamber lf2..V Jet engines: IA receive fuel through.. fuel' lines, l5;

while` a torque or thrust measuring and1record` ing ldevice I6, as shown;` is connected tdeacheri-l gine I4.

Exhaust gases: from engines I4 which gasesaref normally at a temperature of,A 15,00,o to 3.5.Q0. are discharged intoY chambers I2. and pass, thrcughfan expanding.I throat, I1 associated with each cell III,y and into indirect-heat exchange rer laticmship` with steamv generating. surface [8,- O .f' waste heat boilers IB in communication reencuetivelyi with each expanding throat., After flows ing;` in. heat exchange relationship with steam generating surface I 8.-,v the gases are. further cooled by passing in indirect, heat exchange rela-2. tionship with the tubes 2,0. ofk a. gas.A cooler 2|, the tubes 2l)y receiving cool Water through. con-l duit 22l and.k discharging heated Water through.'

conduit 2,3.

Gases, which. new in heat exchange relation. ship with vapor generating surface I84 o f waste heat boiler' L9 and cooler 2l., are-cooled, to. apr# proximately F. After passing from.y @091er 2li, the gases ilowinto. a duct` 24. controlled. by a valve, 2,5 and thence into a distributing header 26,. The gases are distributed throughout header 2t, the gases from one cell I-0 entering header 26- adjacent one end thereof, whilethegasesfrom the other cell |01 enter header Z6 adjacent the other end thereof.

A plurality of steam jet ejectors -21, communi, cate with header 26., each ejector being incom-H munication at the inlet endl 28-` thereof with, one end of a ductv 29 which duct is controlled', by a valve 30. The ducts 29 communicate at the op posite end thereof with header 26. at points. in spaced relationship with one another longitudinally kof the header. The discharge 3z-l ofY each of the steam jet ejectors communicate with a spray condenser 32 each comprising; a" spray,Y chamber having a spraydevice, not shown. in the upper part thereof. The spray 'device oteach condenser receives cooling water through a. pipe 33 controlled by a valve 3-3 and Connected t0; a main conduit 33. Steam jet ej'ectors 2l receive steam through a steam line -34- which.y is-incornmuncation with Waste heat boilers [9; through branch lines 35v controlled by a va1ve36 and with the steam ejectors through branch lines 3,-lf controlled by valvesl 38. Condensible steam and vapors in the exhaust gases are condensed: in

through line V55.

chambersuZ-{and uncondensible'gases are Washed and further cooled therein. The Washed and cooled gases discharge from the spray chambers through discharge conduits 59 at the top of the chambers into header 49, while the condensed steam vapor and cooling water from the charnbers 32 are pumped by pumps II through valve controlled conduits 42 into a header IZ'A thence to Y a skimming basin t3. In the basin 43, tar, carbon or hydrocarbon discharged by the jet propulsion enginesl I into the exhaust. gases are skimmed from the water and condensate from into line 35 and enters Waste heat boiler I9,

spray chambers 32 so that the Water may be reused, which Water is Withdrawn from basin 43 through discharge line d4'. v

Centrifugal type exhausters 45 tvvo of which are illustrated, have their suctions 46 connected tojrheader lill, the suctions beingV controlled by valves lil. Exhausters 45 are driven mechanically'through electric motors or prime movers I5rv and normally are operated so as to have an` intake pressure substantially equalvto the delivery pressure of the gases from ejectors 3l.

However, header 40 is in communication directly with header 26 through by-passconduit 48 and exhausters d5 may, therefor, be operated at substantially the same pressure as the intakeA pressure y.offheader 26, as will hereinafter be-fully described. By-pass conduit 48 is controlled by an automatically controlled Valve I9 Which valve is responsive to the pressure in header 49 through pipe 59 so that the maximum pressure in header 40 may be controlled when ejectors 21 are in operation. V4When ejectors 2'1 are not in operation and valves 3U are closed, the autof matic control valve 49 is reset fora different control pressure in header 45er is locked with the valve in full open position. f v

Exhausters 45` discharge into a header 5I through dischargev connections 52 controlled by valves 53. munication with another exhauster 54,- which is similar to exhausters 45, the suction of said exhauster 54 communicating with vheader 5I Exhauster 55, as shown, discharges through discharge pipe 56 to the atmosphere. A by-pass 57 controlled by valve 58 cornmunicates at the opposite ends thereof With headers 5I and 46 respectively. Exhau'sters 45 and 54 may act on header 4B as a single exhausting unit by closing valves 53 and opening valves 41 and valves 53 so that gases are discharged from header 40 by exhausters e5 to the atmosphere through discharge pipes 59,' While gasesfrom-header 4i! are also discharged through by-pass 5l, pipe 55, exhauster 513 and line 55.

When jet engines I4 areto be tested under lovv temperatures, refrigerated air enters chamber II through inlets 6I! which, during startingup periods, causes cold air to iiovvr through expanding throats I'I over steam generating surface I8 of Waste heat boilers I9. In order that the liquid in the steam generating surfaces I8 will not freeze, separately fired steam generators 6I are used, the steam from which Vi'lov'vs through valve controlled steam lines 62 into thevvaste heat boilers through branch lines 35 controlled by valves 36 thereby causing the steam generating surfaces ofthe Waste heat boilers to become heated. v

'Feed Water for boilers '6I enters said 'boilers through conduit 23, While feed Water for waste heat boilers IQis passed from boilers 5I to the The header 5I is, as shown, in com`v In operation, when a. jet motor is to be tested on header ti.

heating the wasteheat boiler sufiiciently to prevent freezing of the liquid therein. Steam from boiler 6I is also passed to steam jet ejectors 21 through lines 62, 35h34 and branch line 3i to operate the ejectors :during the starting-up period of the jet engines. When the jet engine is in full-operation and the gases are heated to their normaltemperature, boilerl GI isno longer operated and the valve in line 621s closed. Steam is then generated `in the Waste heat boiler bythe passage ofthe hot: exhaust gases in heat exchange relationship with thesteam generat-` ing surface cooled.v Steam from-Waste heat boiler I9 is conducted to steam jets Z'I through lines 35, Sliv and branch lines 31 Which causes the steam ejectors to operate. Under normal conditions, valves 25 in'ducts 24 are open as are valves 3G in conduits 29 so that the suction created by opera'- tion of steam ejectors 27 withdraws gases from chamber I2 throughexpanding throat Il, Waste heat boiler I9, gas cooler 2i, duct 25, thence through header 26 into the spray condensers 32. In the spray condensersv 32, condensible steam or vapors in the gases is condensed and is passed to skimming basinffi, as hereinbefore described, While uncondensible gases are Washed inthe spray in said chambersand Withdrawn after Washing through conduits 39 into header /IG by action of exhausters 45, the suctionof which are connected to header.

If the conditions under which the tests-are being made in test cells I@ do not require the use of ejectors 2, valves 3i? in pipes 39 are closed, by-pass valve 49 opened and gas Withdrawn from header 26 through the'action of exhausters 45 This causes the gases from header 26 to flow through by-pass d8, thence through suction conduit I6 to lthe atmosphere ,through discharge conduits is or to vsuction 55 of exhausters 54 through header 5I, thereafter to be discharged to the atmosphere through pipe 5B.

During tests requiring the simulation of low altitude conditions, the rsteam jet ejectors are usually not in operation, the valves 3@ being closed and the by-pass valve i9 in by-pass @i8 being opened so that gasesiiow from the cells to header 25, as hereinbefore described, thence through by-pass d8 into header e0 by action of the exhausters 45 andc5l on header im.

The exhaust gases owing. in heat exchange relationship with the Waste heat boiler when the ejectors are not in use, would cause steam to be generated which steam-would not be utilized. In order that the boiler Water used to generatesuch steam would not be Wasted, valve 36 is closed and steam from the Waste heat boiler is passed through steam line im into a condenser 'I I, Wherein theA steam is condensed and the condensate removed through line 'I2 for further use.

With the present invention, heat from thegases created in a test cell is used to provide means through which said gases and air used to simuvlate atmospheric conditions in a cell are` exhausted from the cellthereby providing a simplied, economical and expeditious method and ap- I8, the gases thereby becoming l. In apparatus for simulation of altitude conditions in the testing of jet propulsion aircraft engines, 'testing cell forming means, a partition dividing said testing cell into an inlet chamber and an outlet chamber, the testing cell being adapted to receive said jet engine so that it receives air from the inlet chamber and discharges exhaust gases into the outlet chamber, the inlet chamber and the outlet chamber of the testing cell being in communication with one another through said engine, refrigerated air conduit means communicating with the testing cell inletv chamber, a steam generator' having a gas inlet and a gasoutlet, the gas inlet being in communication .with said gas outlet ofthe testing cell, the steam generator having steam generating surface in heat exchange relationshipvvth gases flowing from the gas inlet to the gas outlet of the steam` generator, a steam ejector with a suction inlet and a vdischarge outlet, thesuction inlet being in communication with the steam generator outlet, steam conduit means communicating with the steam generator so as to receive steam therefrom and with the steam ejector so as to deliver steam thereto, aseparately iredl auxiliary steam generator in communication with the steam ejector and with the steam r,generating surface of the rstmentioned steam generator so as to deliver steam thereto, gas scrubbing means having a gas inlet and a gas outlet, the scrubbing means inlet being in communication with the discharge of said ejector, and conduit means. in communication with the scrubber gas outlet and through which scrubbed gases pass from the scrubber means.

2. In apparatus for simulation of altitude conditionsin the testing of jetv propulsion aircraft engines, testing'cell forming means, a partition dividing said testing cell into an inlet chamber andv an outlet chamber, the testing cell being adapted to receive said jet engine so that it receives air from the inlet' chamber and discharges exhaust' gases into the outlet chamber, the inlet chamber and the outlet chamber of the testing cell being. in communication With one another through saidengine, refrigerated air conduit lmeans communicating with the testing cell inlet chamber, a steam generator having a gas inlet and a gas outlet,` the gas inlet being in communication with said gas outlet of the testing cell, the steam generator having steam generating surface in heat exchange relationship with gases flowing from the gas inlet to the gas outlet of the steam generator, a steam ejector with a suction inlet and a' discharge outlet, the suction inlet being in communication with the steam generator outlet, steam conduit means communicating with the steam generator so as to receive steam therefrom and with the steam ejector so as to deliver steam thereto,la separately red auxiliary steam generator in communication with the steam ejector and withthe steam generating surface of the first-mentioned steamv generator so as to deliver steam thereto, a condenser having a "gas inlet and a gas outlet, spray means in saidcondenser,

condensing medium conduit means in coinrnunication with the spray means, the gas inlet, the gas outlet and the spray meansbeing so arranged that gas passes in directheat exchange relationship with spray in the condenser, the inlet of the condenser beingv in communication with the discharge of said ejector, means in communication With the condenser gas outlet for withdrawing uncondensible gases fromy theA condenser, andother means throughV Which condensate is withdrawn from said condensen 3. In apparatusA for simulation of altitude conditions in the testing of jet propulsion aircraft engines, testing cell forming means, a partition dividing said testing cell intol an inlet chamber and an outlet chamber, the testing cell being adapted to contain said jet engine so that it receives air from the inlet chamber and discharges exhaust gases into the outlet chamber, the inletchamber and the outlet chamber of the testing cell being in communication with one another through said engine, air conduit means communicating with the testing cell inlet chamber through which air atthe desired' atmospheric condition enters said cell, a steam. generator having a gas inlet and a gas outlet, thegas inlet being in communication with said gas outlet chamber, said steam generator having steam generating surface in heat exchange relationship with gases flowing from the gas inlet to the gas outlet of the steam generator, an elongatedr header, a gas discharge conduit communicating with the steam generator gas outlet and the header, a plurality of steam jet ejectors each having a suction inlet and a dischargeoutlet, the suction inlets being in communication with said header at spaced points longitudinally of the header, steam-conducting means communicating with the steam-generating surface of said steamgenerator soas to receive steam therefrom and with the steam jet ejectorsso as to'deliver steam thereto, a plurality of gas scrubbers each having a gas inlet and a .gas out-v let, the gas inlet of each of the scrubbers being in communication with a discharge outlet of one of thesteam jet ejectors, another elongated.

header, the gas outlets of said scrubbers being in communication with the other header at spacedv points longitudinally ofsaid other header, and

exhauster means in communication vvith said` and an outlet chamber, the testing cell being adapted to contain saidjet engine so that it receives air from the. inlet chamber and discharges exhaust gases into the outlet chamber, the inlet chamber and-the outlet chamber of the testing cellbeing in communication with one another through said engine, air conduit means communicating with the testing cell inlet chamber through which air at the desired atmospheric condition enters said cell, a steam generator having a gas inlet and a gas outlet,'the gas inlet being inv communication with said gas outlet chamber, said steam generator having steam generating surface in heat exchange relationship with gases flowing from the gas inlet to the gas outlet of the steam generator, an elongated header, a gas discharge conduit communicating With the steam generator gasffoutlet and the header, a plurality "of'steam jet ejectors each having ar suction inlet andv al discharge outlet, a valve controlledv connection between. the suction inlet of each ejector and the header, said connection being in communication with said header at spaced points longitudinally of the header, means for conducting steam from the steam generator to said ejectors, a plurality of gas scrubbers each having a gas inlet and a gas outlet, the gas inlet of each of the scrubbers being in communication with a discharge outlet of one of the steam jet ejectors, another elongated header, the gas outlets of said scrubbers being in communication with the other header at spaced points longitudinally of said other header, a by-pass conduit communicating with said header and said `other header and through which gases from the header are by-passed around said ejectors and scrubbers, a valve in said by-pass to control the flow of gases therethrough, and exhauster means in communication with said other header to exhaust gases therefrom.

5. In apparatus for simulation ofA altitude conditions in the testing of jet propulsion aircraft engines, testing cell forming means, a partition dividing said testing cell into an inlet chamber and an outlet chamber, the testing cell .being adapted to contain said jet engine so that it receives air from the inlet chamber and discharges exhaust gases into the outlet chamber, the inlet chamber and the outlet chamber of the testing cell-being in communication with one another through said engine, air conduit means communicating with the testing cell inlet chamber through which air at the desired atmospheric condition enters said cell, a steam generator having a gas inlet and a gas outlet, the gas inlet being in communication with said gas outlet chamber, said steam generator having steam generating surface in heat exchange relationship with gases flowing from the gas inlet to the gas outlet of the steam generator, an elongated header, a gas discharge conduit communicating with ,thev steam generator gas outlet and the header, a plurality of steam jet ejectors each having a suction inlet and a dischargefoutlet, the suction inlets being in communication with said header at spaced points longitudinally of the header, steam-conducting means communicating with the steam-generating surface of said steam generator so as to receive steam therefrom and with the steam jet ejectors so as to deliver steam thereto, a plurality of condensers each having a gas inlet and a gas outlet, spray means in each of the condensers, the gas inlet, thegas outlet and the spray means being so arranged that gas passes in direct heat exchange Arelation-- i ship with spray in the condenser, the inlet of each condenser being in communication with the discharge of one of said ejectors, another elongated header, a discharge connection between the condenser gas outlet of each condenser and said other header, the last-mentioned connections being in communication with said other header at a plurality of spaced points longitudinally of the header, and exhauster means in communication with said other header to exhaust gases therefrom. y

6. In apparatus for simulation of altitude conditions in the testing of jet propulsionaircraft engines, testing cell forming means, a partition dividing said testing, cell intoan inlet chamber and-an outlet chamber,` the testingy cell being adapted to receive said jet engine so that it receives air from the inlet chamber and discharges exhaust gases into the outlet chamber, the inlet chamber and the outlet chamber of the testing cell being in communication WithV one another through said engine, refrigerated air conduit means communicating with the testing cell inlet chamber, a steam generator having a gas inlet and a gas outlet, the gas inlet being in communication with said gas outlet chamber, said steam generator having steam generating surface in heat exchange relationship with gases flowing from the gas inlet to the gas outlet of the steam generator, an elongated header, a gas discharge conduit communicating with the steam generator gas outlet and the header, a plurality of steam jet ejectors each having a suction inlet and a discharge outlet, the suction inlets being in communication with said header at spaced points longitudinally of the header, means for conducting steam from the steam generator to said ejectors,'a separately i'ired auxiliary steam generator in communication with the steam ejectors and with the steam generating surface of the first-mentioned steam generator so as to deliver steam thereto, a plurality of gas scrubbers each having a gas inlet and a gas outlet, the gas inlet of each of thel scrubbers being in communication with a discharge outlet of one of the steam jet ejectors, another elongated header, the gas outlets of `said scrubbers being in communication withthe other header at spaced points longitudinally of said other header, and exhauster means in communication with said other header to exhaust gases therefrom.

7. In apparatus for simulation of altitude conditions in the testingof jet propulsion aircraft engines, testing cell forming means, a partition dividing said testing cell into an inlet chamber and an outlet chamber, the testing cell being adapted to receive said jet engine so that it receives air from the inlet chamber and discharges exhaust gases into the outlet chamber, the inlet chamber and the outlet chamber of the testing cell being in communication With one another through said engine, refrigerated air conduit means communicating with the testing cell inlet chamber, a steam generator having a gas inlet and a gas outlet, the gas inlet being in communication with said gas outlet chamber, said steam generator having steam generating surface in heat exchange relationship with gases flowing from the gas inlet to the gas outlet of the steam generator, an elongated header, a gas discharge conduit communicating With the steam generator gas outlet and the header, a plurality of steam jet ejectors each having a suction inlet and a discharge outlet, a valve controlled connection between the suction inlet of each ejector and the header, said connections being in communication with said header at spaced points longitudinally of the header, means for conducting steam from the steam generator to said ejectors, a separately red auxiliary steam generator in communication with the steam ejectors and with the steam generating surface of the first-mentioned steam generator so as to deliver steam thereto, a plurality of condensers each having a gas inlet and a gas outlet, spray means in'each of the condensers, the gas inlet, the gas outlet and the spray means being so arranged that gas passes in direct heat exchange relationship with spray in the condenser, the inlet of each condenser being in communication with the discharge of one of said ejectors, another elongated header, a discharge connection between the condenser gas outlet of each condenser and said other header, the last-mentioned connections being in communication With said other header at a plurality of spaced points longitudinally of the header, a

lfrom the header are by-passed around saidejectors and'scrubbers a valve in saidby-pass to i control the now of gases therethrough,and exhauster means-'in communication with said other header to exhaust gases therefrom.

8. In apparatus for testing under atmospheric .v conditions engines which discharge heated exhaust gases, said apparatus comprising a testing.

cell adapted to receive atmosphere and contain the engine so that it is subject to the atmospheric condition in the cell, said cell having a gas outlet through which exhaust gases are discharged therefrom, a steam generator having a gas inlet and a gas outlet, the gas inlet being in communication With said gas outlet of the testing cell, the steam generator having steam generating surface in heat exchange relationship with gases flowing from the gas inlet to the gas outlet of the steam generator, a steam ejector with a suction inlet and a discharge outlet, the suction inlet being in communication with the steam generator outlet, steam conduit means communicating With the steam generator so as to receive steam therefrom and with the steam ejector so as to deliver steam thereto, a separately fired auxiliary steam generator in communication with the steam ejector and with the steam generating surface of the first-mentioned steam generator so as to deliver steam thereto, gas scrubbing means having a gas inlet and a gas outlet, the scrubbing means inlet being in communication with the discharge of said ejector, and conduit means in communication with the scrubber gas outlet and through which scrubbed gases pass from the scrubber means.

9. In apparatus for testing under atmosphericl conditions engines Which discharge heated exhaust gases, said apparatus comprising a testing cell adapted to receive atmosphere and contain the engine so that it is subject to the atmospheric conditionin the cell, said cell having a gas outlet through which exhaust gases are discharged therefrom, a steam generator having a gas inlet and a gas outlet, the gas inlet being in communication with said gas outlet of the cell, said steam generator having steam generating surface in heat exchange relationship with gases owing from the gas inlet to the gas outlet of the steam generator, an elongated header, a gas discharge conduit communicating with the steam generator gas outlet and the header, a plurality of steam jet ejectors each having a suction inlet and a ischarge outlet, the suction inlets being in communication with said header at spaced points longitudinally of the header, steam-conducting means communicating with the steam-generating surface of said steam generator so as to receive steam therefrom and with the steam jet ejectors so as to deliver steam thereto, a plurality of gas scrubbers each having a gas inlet and a gas outlet, the gas inlet of each of the scrubbers being in communication With a discharge outlet of one of the steam jet ejectors, another elongated header, the gas outlets of said'scrubbers being in communication with the other header at spaced points longitudinally of said other header, and exhauster means in communication with said other header to exhaust gases therefrom.

l0. 1n apparatus for testing under atmospheric conditions engines which discharge heated exhaust gases, said apparatus comprising a testing cell adapted to receive atmosphere and contain i the engineA so that is subject a to the, atmosgas outlet through Whiclie haust/gases a,

pheric vcondition in the celL/` said celly charged therefrom, a steamjgeneratorhaving a lgas inlet and agasv outlet, the zgas inlet beingjin communication with said gas outlet, of ,th "cell,

said steam generator having steam; "'gfene ating surface iniheat exchange relationship with gases liovving from the gas inlet to the gas outlet of the steam generator, anielongalted header, a gas discharge conduit communicating -W'th the steam generator gas outlet and thejhe v fja plurality of steam jet ejectors each having a uctioninlet and a dischargeoutlet, a valve controlled connection between the suction inletl of each ejector and the header, said connection being in communication with said header at spaced points header at spaced points longitudinally of said other header, a by-pass conduit communicating with said header and said other header and through which gases from the header are bypassed around said ejectors and scrubbers, a valve in said by-pass to control the flow of gases therethrough, and exhauster means in communication with said therefrom.

11. In apparatus for testing under atmosphericfv "A conditions engines which discharge heated exhaust gases, said apparatus comprising a testing;

cell adapted to receive atmosphere and contain y the engine so that it is subject to the atmospheric condition in the cell, said cell having a gas outletv through which exhaust gases are discharged y v therefrom, a steam generator having a gasA inlet and a gas outlet, the lgas inlet being in communication with said gas outlet ci the cell, said steam generator having steam generating surface in heat exchange relationshipwith gases flowing l from the gas inlet to the gas outletof the steam generator, an elongated header, a gas discharge conduit communicating with the steam generator gas outlet and the header, a plurality of steam jet ejectors each having a suction inlet and a discharge outlet, a valve controlled connection between the suction inlet of each ejector and the header, said connections being in communication with said header at spaced points longitudinally of the header, means for conducting steam froml the steam generator to said ej ectors, a separately ired auxiliary steam generator in communication with the steam ejectors and with the steam v generating surface of the first-mentioned steam generator so as to deliver steam thereto, a plurality of condensers each having a gas inlet and n, a gas outlet, spray means in each of the condensers, the gas inlet, the gas outlet and the spray means being so arranged that gas passes in direct exchange relationship with spray in the condenser, the inlet of each condenser being in communication with the discharge of one of said ejectors, another elongated header, a discharge connection between the condenser gas outlet of each condenser and said other header,

the last-mentioned connections being in communication with said other header at a plurality of spaced points longitudinally or" the header, a by-pass conduit communicating withk other header to exhaust gases said header arxd said other header and through which gases from the header are luy-passed around said ejectors and scrubbers, a Valve iny EDWIN LUNDGREN..

REFERENCES CITED The following references are of record in the le of this patent:

Number Number 12 UNITEDVSTATES PATENTS n Name Date Herr June 22, 1926 Herr June 21, 1927 Wondra Feb. 19, 1935 FOREIGN PATENTS Country Date Great Britain Oct. 26, 1938 

